what is mole concept.? .calculate the number of molecules in 45 gram of water
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one mole is defined as the amount of substance of a system which contains as many entities like atoms ,molecules and ions as there are atoms in 12 grams of carbon 12 .
gungun38:
Sorry i forgot to answer the 2 nd part ... molar mass of water molecule 18 g i.e 18 g of water contains 1 mole of water molecule or 6.022×10²³ molecules so 45 g of water will contain 6.022×10²³ molecules = 45/18 × 6.022× 10²³ = 2.5 × 10²³ molecules approx...
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According to the mole concept, every substance of one mole of it's amount ,has 6.022×10²³ amount of molecules.
Now for the mathematical problem mentioned in the question,
One mole of water = (2×1 + 16) = 18 grams.
So,
18 grams of water has = 6.022×10²³ molecules
1 gram of water has = 6.022 × 10²³ / 18 molecules
45 gram of water has = 6.022 × 10²³ × 45 / 18 = 1.505×10²⁴ (approx.) molecules (answer)
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